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How about a solar car port on a budget?


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@007 RED the roof looks ideal.

 

Do be aware this is not a job to do alone, you'll need an assistant, the steel lengths are not light and the 300W panels weigh 23kg or so each.

 

The lad on the roof is my Thai step-son.

 

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Some of you may remember us building this back in 2015.     Thread here https://forum.thaivisa.com/topic/481794-housebuilding-thread/?do=findComment&comment=9603407  

Warning - solar panels are 'kin heavy when you have to lift them onto the roof 🙂   Finally, the 4 panels are in place.     Panels are fixed using plates and long screws i

Something like this:-  

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17 hours ago, Muhendis said:

An idea which I am assured works well is to arrange a watering system to pump water from a tank onto the top of each panel and collect it in a gutter when it reaches the bottom. The water is then circulated back into the tank. This serves three purposes:

  1. The panel is kept clean.
  2. The panel is kept cool.
  3. You get some free warm/hot water.

I have not tried this myself but it was done in Australia by a TV contributor by the name of Jingjoe. It is on my to do list.

By the way I like the angle of your car port roof. It looks optimum to me.

 

17 hours ago, johng said:

A spray bar system could work to keep the panels clean also it could keep them cool and so provide more power output...it could also be self powered as in when the panels make electricity some can be diverted to a water pump with closed loop water supply.

Many thanks for the suggestion of a 'close loop' water spray system.  Certainly an option to investigate and the bonus of helping to keep the panels a bit cooler and, therefore, more efficient is appealing. 

 

The only problem I foresee is that the 'coffee' dust will dissolved in the run-off water and after several cycles the water may become very dirty and defeat the original objective of keeping the panels clean.  A filter in the water system maybe a needed.

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16 hours ago, sometimewoodworker said:

All good if you don't have hard water, if you do the cure will be worse than the disease 

Could you please expand on your advice.... what adverse affect will hard water have on the panels?

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3 minutes ago, 007 RED said:

what adverse affect will hard water have on the panels?

if the water is "hard"  it will have minerals dissolved in it, so its possible that "limescale" will form on the glass which would certainly reduce efficiency... so  use rain water captured from the roof which should be quite free of minerals.

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6 hours ago, Crossy said:

@007 RED the roof looks ideal.

 

Do be aware this is not a job to do alone, you'll need an assistant, the steel lengths are not light and the 300W panels weigh 23kg or so each.

 

The lad on the roof is my Thai step-son.

 

Thanks for the safety warning, much appreciated. 

 

Mrs MoneyBaht and I went to our local Global Home store last week and they had the same panel in stock and at the same price as you quoted.  I tried to lift one to get some idea of their weight, and as you have indicated, yes they are quite heavy!  I think if I go ahead with a solar system I will ask the coffee factory owner if I can borrow their fork lift for an hour - were on good terms.

 

You mentioned the steel lengths which you used to lift the panels off the roof.  I was thinking of using aluminium sections similar to what they use for window/door frames.  It may be a bit more expensive, but they hopefully wont rust.

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15 minutes ago, 007 RED said:

I was thinking of using aluminium sections similar to what they use for window/door frames.  It may be a bit more expensive, but they hopefully wont rust.

You might like this

http://mechashop.weloveshopping.com/store/product/อุปกรณ์ยึดแผงโซล่าเซลล์-2052783-th.html

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17 hours ago, sometimewoodworker said:

All good if you don't have hard water, if you do the cure will be worse than the disease 

I'm a bit 50:50 on that one. Calcium will certainly precipate out of water given heat and stationary water but I'm not convinced that flowing water over glass will be a problem. Given lack of knowledge I think I would err on the side of caution and use soft water.

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29 minutes ago, Muhendis said:

I'm a bit 50:50 on that one. Calcium will certainly precipate out of water given heat and stationary water but I'm not convinced that flowing water over glass will be a problem. Given lack of knowledge I think I would err on the side of caution and use soft water.

Like you I'm not sure what the affect of hard water will be on the upper surface of the solar panel.  You mention glass.  But is it glass or some form of plastic like they use on LED TV's screens?

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3 minutes ago, 007 RED said:

But is it glass or some form of plastic like they use on LED TV's screens?

All the "proper" solar panels I've seen use glass... I would think the suns UV rays would damage the plastic quite quickly ?

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